# HG changeset patch
# User Shriram Rajagopalan <rshriram@xxxxxxxxx>
# Date 1314721390 -3600
# Node ID b29552e599c817b0e4debb239e79e21278130790
# Parent f829cb802b91313d17001c73b1b64e4172f1d290
remus: blackhole replication target
The new --null option allows one to test and play with just the
memory checkpointing and network buffering aspect of remus, without
the need for a second host. The disk is not replicated. All replication
data is sent to /dev/null. This option is pretty handy when a user
wants to see the page churn for his workload or observe the latency hit
though the latter will not be accurate.
Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
xen-unstable changeset: 23196:29d81623dc14
Backport-requested-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
diff -r f829cb802b91 -r b29552e599c8 tools/python/xen/remus/save.py
--- a/tools/python/xen/remus/save.py Tue Aug 30 17:16:42 2011 +0100
+++ b/tools/python/xen/remus/save.py Tue Aug 30 17:23:10 2011 +0100
@@ -95,6 +95,12 @@
self.sock = sock
super(MigrationSocket, self).__init__(fd)
+class NullSocket(_proxy):
+ def __init__(self, address):
+ filedesc = os.open('/dev/null', 0666)
+ fd = os.fdopen(filedesc, 'w+')
+ super(NullSocket, self).__init__(fd)
+
class Keepalive(object):
"Call a keepalive method at intervals"
def __init__(self, method, interval=0.1):
diff -r f829cb802b91 -r b29552e599c8 tools/remus/remus
--- a/tools/remus/remus Tue Aug 30 17:16:42 2011 +0100
+++ b/tools/remus/remus Tue Aug 30 17:23:10 2011 +0100
@@ -21,6 +21,7 @@
self.domid = 0
self.host = 'localhost'
+ self.nullremus = False
self.port = XendOptions.instance().get_xend_relocation_port()
self.interval = 200
self.netbuffer = True
@@ -33,6 +34,8 @@
help='checkpoint every MS milliseconds')
parser.add_option('-p', '--port', dest='port', type='int',
help='send stream to port PORT', metavar='PORT')
+ parser.add_option('', '--blackhole', dest='nullremus',
action='store_true',
+ help='replicate to /dev/null (no disk checkpoints,
only memory & net buffering)')
parser.add_option('', '--no-net', dest='nonet', action='store_true',
help='run without net buffering (benchmark option)')
parser.add_option('', '--timer', dest='timer', action='store_true',
@@ -49,6 +52,8 @@
self.interval = opts.interval
if opts.port:
self.port = opts.port
+ if opts.nullremus:
+ self.nullremus = True
if opts.nonet:
self.netbuffer = False
if opts.timer:
@@ -107,18 +112,22 @@
bufs = []
# disks must commit before network can be released
- for disk in dom.disks:
- try:
- bufs.append(ReplicatedDisk(disk))
- except ReplicatedDiskException, e:
- print e
- continue
+ if not cfg.nullremus:
+ for disk in dom.disks:
+ try:
+ bufs.append(ReplicatedDisk(disk))
+ except ReplicatedDiskException, e:
+ print e
+ continue
if cfg.netbuffer:
for vif in dom.vifs:
bufs.append(BufferedNIC(vif))
- fd = save.MigrationSocket((cfg.host, cfg.port))
+ if cfg.nullremus:
+ fd = save.NullSocket((cfg.host, cfg.port))
+ else:
+ fd = save.MigrationSocket((cfg.host, cfg.port))
def postsuspend():
'Begin external checkpointing after domain has paused'
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
Home